After more than six years, the murders of Tupac Shakur and the Notorious B.I.G. remain officially unsolved, but Sylvester Stallone will try to solve them onscreen. Variety reports that he’s directing and starring in a movie about the Los Angeles police detective who found himself investigating both crimes, only to be stymied by what he said were coverups related to the unfolding Rampart police corruption scandal.

Tentatively titled ”Rampart Scandal,” the film will center on LAPD sleuth Russell Poole, who told his story in Randall Sullivan’s book ”Labyrinth” and in Nick Broomfield’s documentary ”Biggie and Tupac.” The screenplay, which Stallone rewrote from an earlier draft by Mikko Allane, tells the story from multiple perspectives, à la ”Rashomon,” Stallone tells Variety. Franchise Pictures, which backed Stallone’s ”Driven” and ”Get Carter,” will produce. He expects to start filming in September.

Stallone says he’s talking to rap mogul Suge Knight about playing himself in the film. That seems unlikely, given that Poole has repeatedly fingered Knight as being behind the 1997 Biggie shooting. Knight, who was in the car with Biggie’s rival Tupac when Shakur was fatally shot in 1996, has repeatedly denied involvement in either killing.